The custom-designed two-wheeler, which is almost ten feet in length, can hold up to 30 samples, which are stored in a special vacuum container cooled with liquid nitrogen.

The motorised bike, which features an oversized model of a sperm cell, has been developed to quickly and efficiently move donated sperm, and is being used by the Seattle Sperm Lab to service nearby reproductive centres and fertility clinics.

‘It’s getting a lot of looks. People are stopping. They don’t quite understand what’s going on,’ said Gary Olsem of Seattle Sperm Bank.

Olsem says the bike is not only green-friendly, but also helps to raise awareness about the need for sperm donation.

‘It is not only cutting CO2, but I think itâs really getting the word out about the need for sperm donors,’ he said.

‘At first, people are shocked and surprised, but then they tell us what a great idea it is.’

The first Sperm Bike was used by Seattle Sperm Bank’s sibling company, the European Sperm Bank, in Copenhagen.